John f



(No Model.)

J. P. MUMM.

DAVIT PORBUATS. No. 272,745. Patented Ieb.20,1883^I A VBNTOR: s

ATTORNEYS.

UNITED STATES PATENT Orr-Fics.

JOHN F. MUMM, or BROOKLYN, NEW YORK.

DAvlT FOR'BOATS.

SPECIFICATION forming part of Letters Patent No. 272,745, dated February 20, ,1883.

Application filed October 9,1882. (No model.)

To all whom it may concern:

Be it known that I, JOHN F. Mui/rit, of South Brooklyn, in the county of Kings and State ot' New York, have invented a new and useful Improvement iuDavits for Boats, of which the following is a full, clear, and exact description.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar letters Qt' reference indicate corresponding parts in all the t'igures.

Figure 1 is a side elevation ot' myimprovement, partly in sect-ion. Fig. 2 is a rear elevation ofthe lower part of the davit. Fig. 3 is a rear elevation ofthe davit socket and bolt.

The object of this invention is to econonlize space and promote convenience in the raising and lowering ot' boats.

A is the darit-arin, which is curved outward, and is provided at its outer end with a tackle, in the ordinary manner. The lower end of the devit-arm A is bent to the rearward, as shown'in Fig. l` and is provided near its lower end with shoulders B upon its opposite sides,

as shown in Fig. 2. The lower end of the davit-arni A tits into the davit-socket C, which is formed of two parallel plates, secured at their lower ends to or formed upon the upper end of the davitbolt D. The upper edges ot' the plates of the socket are curved in the arc of a circle, and have shouldersE formed upon their ends. The lower end of the davit-arm A is hinged in the lower part of the socket C bya pin, F, passing` through the said socket and through the said davit-arm. The movement ot' the davit-arm A in the socket C is limited by the shoulders E, formed upon the upper edge ofthe said socket, and against which the shoulders B ot' the said davit A strike. Viththis construction the davits A can be readily pushed outward to carry the boat beyond the side of the vessel G, so that the boat can be lowered and raised freely, and

can be drawn inward when the boat is raised to bring the said boat over the deck ot' the vessel, as indicated in dotted lines in Fig. l. With this construction the davits will be held in place in either position by the weight ofthe boat, but may be further secured in place by a pin, H, passed through a hole in the upper d part ot' the socket C and in the said davitarm A.

The davit-arrn A can be secured in an intermediate position by passing the pin H through a hole in the middle upper part of the socket C and through the said davit-arm. l

The davit-bolt D passes down through the rail Ia11d screws into the deck-timbers of the vessel, so that the davit will be firmly supported. The part of the rail I through which the bolt`D passes is strengthened by a metal plate, J, attached to the said rail, and perforated for the passage of the said bolt.

I am aware that it is not new to hinge-joint a davit-arm so that it may be turned back into the vessel and require it to be held over the water by vertical supports from the edge of the deck of the vessel; but

What I do claim as new and of my invention is- A davit-arm pi-voted to turn between lateral guides and stops E E, whereby the boat will be held over the deck of vessel or over the water by gravity` as described.

2. The screw-bolt D,having' the plates O C, extending up from two opposite sides ot' its head, provided with opposite bearing-holes for a pivot near the bottom of said plates, and

having the shoulders E E on the upper corners of said plates, in combination with a davitarm, as shown and described.

v JOHN F. MUMM.

W` tnesses:

J AMES T. GRAHAM, C. SEDGWIOK. 

